Boost timer.

1. #include <iostream>
2. #include <boost/asio.hpp>
4. int main ()
5. {
6. Boost::asio::io_service io;
7. Boost::asio::d eadline_timer timer (io, boost::p osix_time::seconds (3));
9. Timer.wait ();
10. Std::cout << "Hello, world!\n";
12. return 0;
13. }

One more asynchronous:

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2. void print (const boost::system::error_code& /*e*/)
4. {
6. Std::cout << "Hello, world!\n";
8. }
10. int main ()
12. {
14. Boost::asio::io_service io;
16. Boost::asio::d eadline_timer timer (io, boost::p osix_time::seconds (5));
20. Timer.async_wait (&print);
22. Io.run ();
26. return 0;
28. }

The basic usage was demonstrated last time, but it only happens once.

The question is how to define a recurring timer (it happens once in a certain time). , the following code is, the key is that the callback function changes the delay constant extension timer

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2. void print (const boost::system::error_code& E,
4. Boost::asio::d eadline_timer* t)
6. {
8. cout<<"DDD" <<endl;
10. T->expires_at (T->expires_at () + boost::p osix_time::seconds (1));
12. T->async_wait (Boost::bind (print,boost::asio::p laceholders::error,t));
14. }
18. void Test1 ()
20. {
22. Boost::asio::io_service io;
24. Boost::asio::d eadline_timer t (io, boost::p osix_time::seconds (1));
26. T.async_wait (Boost::bind (print,boost::asio::p laceholders::error,&t));
28. Io.run ();
30. }
34. int _tmain (int argc, _tchar* argv[])
36. {
38. Test1 ();
40. System ("pause");
42. return 0;
44. }

Boost timer.